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U ITED STATES PATENT OFFICEO JOHN O. 0. CARLTON, OF PALMETTO, GEORGIA.

DEVICE FOR OVERCOMING DEAD-CEN''ERS.

SPECIFICATION forming part of Letters Patent No. 239,443, dated March 29, 1881.'

Application filed February 12, 1881. (No model.)

To all whom it may concem:

Be it known that I, JOHN O. C. CARLTON, acitizen of the United States, resident at Palnetto, in the countyof Campbell and State of Georgia, have invented certain new and use-- ful Improvements in Devices for Overcoming Dead-Centers; and I do hereby declare the following to be a fulhelear, and exact deseription of the invention, such as will enable others skilled in the art to which it appeartains to make and use the same, reference being hadto the aceompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification, in which- Fi gure l represents the device applied. Figs. 2, 3, and 4 represent different forms of 'cluteh.

This invention relates to devices for converting notion, more particularly those for overeoming the dead-center.

The invention. consists in the construction hereinafter described.

In the drawings hereto annexed, Arepresents the driving mechanism of a sewing-machine wherein my invention is displayed.

B is the drive-wheel, arranged, preferably, outside of the frame, and having the rgid spindle b extending within.

O C are the propelling-levers, eonsisting of a sten, c, and bifurcated head z, having the cheeks y y. Pivoted between these cheeks is a pawl or cam-dog, D, held inwardly by a spring, E. This pawl is longer from point d to pivot F than from point d to point x, the line d x being the cam-surface. In the ends of cheeks y y are made the registering transverse oblong slots n n.

G is a bearing-block placed between the ends of the checks beyond slots n n, and H is a set-screw passing through the end of'head z and holding the block Gr down. The spindle b passes through slots n n, the block G holding it snug, preventing play, but allowing motion rotatively of the spindle independently of the head.

The lower ends of the lever-stems are connected by the rods I l with the opposite ends of the treadle K, as shown, so that the operation of the latter will alternately move the levers C C. As one end of the treadle rises the lever connected therewith binds its pawl against the spind1e,turning the wheel. As this end comes down the lever slips on the spindle, allowing the wheel driven by the' tially as described.

In testimony whereof I atfix my signature in presence of two witnesses.

JOHN o. e. GARLTON.

Witnesses:

F. F. STEED, L. W. HARRIS. 

